y9 geography Flashcards
(14 cards)
birth rate
number of babies born per thousand people per year
death rate
the number of deaths per thousand people per year
rural to urban migration
the movement of people from areas of the countryside to the town or city
international migration
the movement of people from one country to another
infant mortality
the number of babies who die in the first year of their life per 1000 births
life expectancy
the average number of years a person is expected to live at birth
tectonic plates
pieces of the earths solid crust that move gradually over time
plate boundaries
the areas where tectonic plates meet where the majority of earthquakes and volcanoes occur
epicentre
the exact point on the surface of the earth where an earthquake is first detected
pyroclastic flow
this is released from a volcano and contains super heated air, ash and debris
what is the first layer of the earth called
inner core
what is the 2nd layer of the earth called
outer core
what is the 3rd layer of the earth called
mantle
what is the 4th layer of the earth called
crust
